noun dominion; empire; authority.
2. domain ·noun landed property; estate; especially, the land about the mansion house of a lord, and in his immediate occupancy; demesne.
3. domain ·noun ownership of land; an estate or patrimony which one has in his own right; absolute proprietorship; paramount or sovereign ownership.
4. domain ·noun the territory over which dominion or authority is exerted; the possessions of a sovereign or commonwealth, or the like. also used figuratively.